Here is my current project. Tamiya '66 Beetle with Fujimi Porsche 930 turbo engine. I am going for sleeper look, no modifications to body, it will be painted with some matte colour with rust and etc.
First I fitted Porsche rear axle to beetle chassis.
Then build rollcage from aluminium tube, seat is resin from Reji. Also made new gastank and place for battery in boot.

Tank on left (no filler cap yet), battery place right. (lots of sanding ahead)
Here engine in place, rollcage and other parts painted.
Almost all tubes from turbo are made of tinwire by me and painted black, because original parts didn't fit to beetle. Front brakediscs from rally Lancer, rear aftermarket from parts box. Backseat covered with sheet of styrene.
Here pics with body and rims.